Machine for filing cotton-gin saws



(No Model.) 2 Sheets-Sheet 1. W. H. BLANGHARD.

MACHINE FOR FILING COTTON GIN SAWS.

P tented Mar. 16, 1886.

NY PEYERS. Phclo-Lflhogmphcr, Washington. D4 0.

(No Model.) 2 Sheets-Sheet 2 W. H. BLANOHARD.

MACHINE FOR FILING COTTON GIN SAWS.

No. 338,025. Patented Mar. 16, 1886,

raven/6 07': Q TM 1 NITED STATES ATENT FICEQ MACHINE FOR FILING COTTON-GIN SAWS.

SPECIFICATION forming part of Letters Patent No. 338,025, dated March 16, 1886.

Application filed July 24, 1885.

To all whom, it may concern:

Be it known that I, WILLIAM H. BLANCH- ARD, a citizen of theUnited States, residing at Gainesville, in the county of Hill and State of Georgia, have invented certain new and useful Improvements in Machines for Filing Cotton-Gin and Linter Saws; andI do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, referenee being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

My invention relates to mechanism designed for forming needle-pointed teeth on gin and linter saws; and it consists in certain improvements on a machine for this purpose patented by me on the 10th day of July, 1883, No. 280,900.

Referring to the accompanying drawings, Figure 1 is a plan of my machine with portions removed or broken away. Fig. 2 is a side view, and Fig. 3 a top view, of a cheekpiece and a portion of a rest-bar, showing the manner of making the rest-bar adjustable in the cheek-pieces. Fig. 4 is a front view, and Fig. 5 a side view,ofa portion of the feed-bar provided with three hits, one of the side bits in Fig. 5 being thrown up out of working position. Fig. 5 represents the file-holder.

Similar letters of reference refer to like parts in all the figures.

The frame-work of the machine consists of a rear upright and rectangular end piece, a,

to which are secured by bolts horizontal side rails, b b, which are united at the front by an integral cross plate or rail, 0.

A represents the main or crank shaft of the machine, and it is provided with a crank, a, and rotates in bearings 06", fixed to the side rails. b b. At the center of the shaft A isa fixed master gear, A, which meshes with a pinion, B, fixed to a short counter-shaft, O, mount ed in brackets 0, formed upon or secured to the rear end piece, a.

Upon the ends of counter-shaft Care fixed disks 0', to which connecting-rods D D are attached by ordinary adjustable wrist-pins, c, the heads d of which are pivoted to the said Serial No. 172,543. (No model.)

rods. The rod D is pivotally connected to a similar head, d, at its front end, which head is pivotally connected by a bolt or screw, d, to a cross-head, E, located above the horizontal center of the machine, while rod D is in like manner connected and arranged with reference to a second cross-head, E, extended below said center of the machine, the construction of the parts in each being as follows: Each of the cross-heads slides upon guides E", supported at their rear ends upon studs F, secured by set-screwsf in socket-s formed upon the side rails, I), having slotted iuwardly-projecting curved armsf, and at their front ends said guides rest against the upper and lower surfaces, respectively, of the cross-barc of the frame-work, which is slotted at c c", for the passage therethrough of bolts f fflwhich bind said front ends of the guides E to links G G, the outer ends of which are connected by a pin or bolt, 9. passing through aslot, c, in cross-bar 0. ,One of the links G is provided with a projecting arm, G, constituting with thelink a bell-crank, which is connected by a rod, G with bar G, supported upon the inside of the bearing a and in the rear framepiece, a, and provided with an inwardly-projecting lug, 9, said bar G being operated by a wrist-pin, h, in a disk, H, secured to the main shaft A. The rear ends of the guide are adj ustably secured in the slots of the arms f of the studs F. Springs I I rest at their ends against the rear side of arms f, and are curved to conform thereto, and are extended to the front, where they rest one upon each of the guides E and against its edge. Screws serve to vary the tension of the springs.

Each of the cross-heads is connected to a file-holder, J, shouldered at its rear end, to fit a bearing for the same formed in the crosshead, and of cylindrical form in crosssection, to fit suitable bearings, E", therefor formed in the front ends of the guides. Each of the holders is exterior-1y grooved, as at j, and in each of the bearings is ascrew (not shown) which projects into the groovej, for giving proper motion to the holder at each stroke. A set-screw, j", serves to secure the shank of the file K within the holder. The files are diamond shape in cross-section, and are presented to the sawv so that one of the sides of the file is brought into contact with the teeth of the saw. v

M represents a yoke, the rear ends of which are fitted in bearings formed on the rear frame, u,and inclose coil-springs (not shown) which encirclesaid yoke ends and act to draw the yoke rearwardly, while lugs m m thereon, when acted upon by projecting wrist-pins or lugs m m formed on the master-gear A, act to press the yoke forward.

The above description embraces so much of the construction covered in my patent above. mentioned as is necessary to show the relation thereto of my improvements on that machine, and it is to be understood that anything shown in' said patent and herein described is. not claimed in this application.

I will now proceed to describe the improvements.

In order to support the front end of the machine, (the rear end being supported by the rear end piece, a,) I secure to the side rails, I) b, cheek-pieces d d, which are clamped tofthe rails by means of a clamp-screw, (1. At their front ends these cheek-pieces are recessed, as shown at d in Fig. 2, and between the recessed ends of the cheek-pieces, on each side of the frame, is placed the rear end of a rest-bar, e, which, for lack of space, are shown broken off, but which are designed to be extended, and when the machine is in use rested upon the shaft orarbor of the saw or saws be-- ing operated upon. The rear end of each restbar is pivoted in the cheel pieces by a headed bolt, 6, passing from the outside through said pieces and through the bar, and engaging with a nut, e, on the inner side, as clearly shown in Fig. 3.

For the purpose of making the rest-bars adjustable vertically to suit different kinds and sizes ofsaws and gins and to change the .pitch of the files on the saws, I provide the front ends of the cheek-pieces with adjusting-screws k 70, one above and the other below the rest-bar, and these screws are provided with jam-nuts H, to aid in holding the bar firmly in position. It will thus be seen that bolt e serves as a pivot for the bar, which can be adjusted up. or down within a. reasonable limit by the screws is k.

A feed-bar, N, is pivotally secured to the front end of yoke M, and extends forward to the saw, (not shown,) where it is provided 'with sidetongues, n, by which it is kept in line with and upon the saw. Instead, however, of the bar being provided with asingle bit', as in my before-mentioned machine, it carries three bits, by which means I am enabled to feed one, two, or th ree saws at the same time. This is an important feature, a defect in the machine alluded to being that in case the bit came to a broken tooth it would not feed over, and the files would then dwell in one place and make an ugly notch in the saw. Now, if I have a saw to operate upon whichhas broken teeth,by placing another alongside of it on the arbor, orone on each side ofiit, a sure feed is obtained by means of the side bit or bits. The two side bits, 0, are pivoted to the feed-bar by a bolt, 0", and are limited in their downward movement .by a bolt, 8, passing through the feed-bar, but are capable of being thrown up out of working position, as shown in Fig. 5. The center bit, 0, is shaped at its inner end to fit a recess, 8, in the end of the feed-bar, and it is adjustably secured to said bar by a screw-bolt, t, passing through a steel plate, 15, and through a slot in the bit,

and thence into the bar, as may be seen in Figs; 4 and 5. By making this bit adjustable in 'a lengthwise direction I am enabled to compensate for the wear of the: bit. The center bit is wholly of steel,.and the side bits tioned machine is objectionable, in that it is: so formed as to give the file a twist all one:

way as it goes forward, whereby either the top or bottom of the teeth is improperly acted It will. be seen: on reference to'Fig. 6:

upon. that I now formithe. groove j spirally in one. direction, then straight, and, finally, spirally .in the oppositedirection, so that the file starts:

off on a twist for one-third the-stroke, then runs straight for a like distance, and then reverses the twist, perfectly rounding the toothat both top and bottom.

With the exceptionof what has been herein stated as to theoperatiou of certain parts,

the general operation of the machine is the,

same as that described in my Patent N 0. 280,900, before mentioned, and therefore need not be herein described.

Having thus. fully set forth my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a saw gumming and filing machine, the combination, with cheek-pieces attached to the side rails of the machine, of vertically: adj ustablerestvbars for supporting the front. of the machine in proper relation to the saw, substantially as described.

2. In a saw gumming and filing machine, the combination, withv cheek-pieces remov-- ably secured-to the side rails of the machine, of vertically-adjustable rest-bars pivoted at their rear ends in the cheek-pieces and governedin their upward and downward adjust ments by adj usting-screwsin the ends of the cheek-pieces, substantially as described.

3. The combination, withthe feed-bar, of a: longitudinally-adj ustable center bit secured to the bar by a screw or bolt, and two side bits pivoted to the bar,,saidv side bits, when in; working position,restingv onthe ends of a rod passing through the head of the feed-bar, substantially as described.

4. The combination of thefile-holder, formed with a groove spiral in one direction, straight,

for a like distance, andthen spiral in. an- 0p posite direction, with a screw fixed in a suit- In testimony whereof I affix my signature in presence of two Witnesses.

WILLIAM H. BLANGHARD.

WVitnesses:

T. D. LATTIMORE, H. K. WINsLoW. 

